hi,
this simple command line helps without fiddling around with broken libraries and foreign packages - just enter it in a terminal before starting the second life client:
tail -f ~/.xsession-errors|gawk '/Starting internet stream:/ {system("vlc "$7" & ")}'
this simply opens media in external player (vlc, which u have set in option to allow only single instance, but this is default afaik), when second life client tries to play it unsucessfully ...
cu!